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Introducing plasticoral: A biogenic–plastic agglutinate as an emerging indicator of the Plasticene in Okinawa reef environments
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Scientists in Okinawa discovered a new type of plastic pollution called "plasticoral," formed when melted plastic fuses onto coral rubble on beaches. This shows plastic isn't just floating in the ocean, it's becoming permanently embedded in reef environments, raising concerns about long-term contamination and potential harm to marine ecosystems that support fish humans eat.
Plastic pollution has become a significant concern for marine environments with adverse effects on critical ecosystems such as coral reefs. Marine plastic litter items transform into new variants after prolonged exposure to the environment and interactions with organic and inorganic materials. While earlier documented variants such as plastiglomerates and plasticrusts are chiefly formed between plastic and abiogenic substrates, this study introduces plasticorals, a new form of plastic litter variant formed from plastic materials thermally adhered to or agglutinated to coral rubble. Plasticorals were incidentally observed on three beaches in Okinawa Island, Japan, during routine marine litter surveys. The plastic components of these plastic-coral agglutinate samples, examined with Raman spectroscopy showed spectral consistencies with polyethylene and polypropylene. The infiltration of skeletal pores and plastic coral interface were visualized using micro-CT scanning and microscopy. This new plastic variant provides fresh perspectives on the persistence of plastic litter in coral reef environments and highlights the potential for plasticorals to serve as future stratigraphic markers within the contemporary sedimentary record of tropical reef systems. We recommend further studies to better understand formation processes, distribution, and potential ecotoxicological impacts of plasticorals on coral reef environments.
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Chemical identification of microplastics in marine organisms from the Ryukyu Archipelago, Japan
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Researchers chemically identified microplastics found in marine organisms from the coral reefs of the Ryukyu Archipelago in Okinawa, Japan, characterizing polymer types and particle abundance in a region under high plastic pollution pressure. The study documented diverse polymer types in reef-associated marine organisms, reflecting the complex mixture of plastic sources in Pacific island coastal waters.
A study of ‘new plastic formations’ found in the Seto Inland Sea, Japan
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Researchers documented new plastic formations on coasts of the Seto Inland Sea in Japan, describing fused and melted plastic-rock composites as a novel anthropogenic geological feature forming on Asian Pacific coastlines.
Chemical identification of microplastics in marine organisms from the Ryukyu Archipelago, Japan
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Researchers chemically identified microplastics found in marine organisms from the Ryukyu Archipelago in Okinawa, Japan, a region identified as a hotspot for plastic pollution threatening coral reef ecosystems. The study characterized the types and abundance of microplastics ingested by reef-associated organisms, providing baseline data for a heavily affected Pacific region.
Plastitar: A new plastic formation that threatens coastal marine environments
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Researchers described a new plastic formation called 'plastitar' — a mixture of petroleum tar and plastic debris found fused together on rocky shores. This novel form of marine plastic pollution represents a previously undescribed threat to coastal ecosystems, both as a physical contaminant and as a potential source of chemical leachates. The discovery adds to the growing list of novel plastic forms being identified in marine environments worldwide.
Marine litter and microplastics in Okinawa marine ecosystems
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This doctoral thesis examined marine litter and microplastic abundance and distribution across Okinawa's marine ecosystems, providing the first extensive beach surveys of both marine litter and plastic variants in the Ryukyu Archipelago, including urban coral reef surveys and microplastic data for remote islands. The study also documented historical microplastic ingestion trends using natural history museum specimens and first-recorded marine plastic variants in the East China Sea, including a new type called 'plasticoral.'
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.